chickenlj commented on issue #1508: feature required: set registrydirectory to 
AP when implementation is CP
URL: 
https://github.com/apache/incubator-dubbo/issues/1508#issuecomment-380387722
 
 
   > here when invokerUrls is empty ,all the invokers are destryed, but in 
fact,ignore it will be more fault tolerance.
   
   What if we want to clear all invokers when receive a empty list from the 
registry center? Do you think we should introduce a new mechanism: 
   1. When we want to clear invokers, send a signal explicitly.
   2. Without an explicit signal, keep using the invokers from the last 
notification when the latest list we receive is empty.
   
   If this mechanism is what you want, do you have any suggestions on how to 
achieve this?

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